Telephone-transmitter



Gl BUISSONNAULT.

TELEPHONE TRANSMITTER.

APPLICATION FILED IULY 22. I92I.

1,401,754,Y Patented B60211921.'

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UNITED sTAfrvvas PATENT orties.

GASTON' BOISSONNAULT, 0F HEWLETT, NEW YORK, ASSIGNOR TO G'. BOSSONN- COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

ULT

TELEPHONE-TRANSMITTER.

Application filed July 22, 1921.

To aZZ'wzom et may conce/m Be it known' that I, GASTON Boisson- NAULT, a subject of the King of Great Britain, anda resident of Hewlett, Long Island, Queens county, and StateA of New York, have invented certain new and usei'ul 1mprovements in Telephone-Transmitters, of whichV the following is a specification.

The present invention relates to telephone transmitters and .particularly transmitters ot'thety'pe which I employ with my Detectagraph apparatus;-

InY apparatus of this character the transmitter is usually hidden the room where the conversation takes place and the receiving apparatus is located in an adjoining room, for instance.

The acoustic properties of diiierent rooms vary more or less and I have found that because oi' this fact the reproductions at the receiving end will sometimes be quite unsatisfactory.V 1 have discoverd that these diniculties can be overcome by controlling the intensity or volume of the sound waves acting on the transmitter. My invention accordingly involves a transmitter of novel construction designed to overcome the diiiiculties mentioned, and provided with means by which the intensity ot the transmitting vibrations may be controlled to suit the acoustics of a particular location.

In the accompanying drawing I have illustrated one of the practical embodiments of the invention, but wish it understood that the same may be Inodiiied in various respects without departure from the true spirit and scope of the invention as hereinafter defined and claimed.

Figure 1 in the drawing referred to, is a central sectional view of the device.

Fig. 2 is a front or face view of the same.

Fig. 3 is a face view of the rear member of the transmitter casing.

The casing of the transmitter comprises in the illustration cooperating back and front shell members 5 and 6 secured together at their edges and clamping between them a diaphragm 7 of carbon or the like having contact with a series of balls or pellets 8 supported in suitable cavities in the face of a block 9 of carbon or the like, carried by a base 10 secured to but insulated from the back member 5 of the casing. 1n this particular disclosure the base 10 has a screw threaded stem 11 extending through Speccation of Letters Patent.

Patented Dec. 27', 1921;

Serial No. 486,738.

the back of the case and engaged by a nut 12, said base being insulated from the case by insulating disks 13 and an insulating bushing i4.

The transmitter case is provided in the the rim of the neel; and pivotally connected at its center withV the center of the inner plate or disk by a pivot stud 2Ot The inner plate or disk is constructed with a number of openings 2l therethrough and similarly the outer or cover plate is provided with openings 22 and the openings in the two plates are so formed that they may be brought either wholly or partly into register by turning one plate with respect to the other.

It will thus be seen that by the rotative adjustment of the cover plate over the inner plate, the admission of sound waves to the diaphragm may be governed at will so that if it is found the vibrations of the diaphragm are too heavy for good voice transmission, the parts may be adjusted to graduate the sound waves and hence modify the efect on the diaphragm. It, on account of peculiar `,characteristics ot a room, the transmitted sounds are relatively weak, the cover plate may be adjusted to open all the sound passages so as to gain the full effect of the sound waves.

It desired, the perforations may be arranged at different radial distances from the pivot center 2O and with the perforations of the inner series offset circumferentially with respect to the perorations of the outer series as shown in Fig. 2, so that at diil'erent adjustments either the outer or inner series of openings may be used selectively, that is, one series to the exclusion or partial exclusion of the other series, so as to direct the sound waves either to the center of the diaphragm or to a point removed from the center of the diaphragm. In other adjustments, portions of both series of openings may be in use and, of course, when the full effect is desired, all the openings of both Si il series will be in use. These various adjustments make it possible to control the sound Waves so as to get the best effect at the receiving end of the apparatus; l

The construction disclosed has proved very eective for the purposes'intended and is, it will be'seen, readily applicable to transmitters now in use. Y

What I claim is: Y

l. The combination with a telephone transmitter provided with a projecting neck, of a perforated platehaving screw threaded connection With said neck and an overlying perforated Acap pivotally connected with said plate.

2. The combination With @a telephone .transmitter provided Tvvith a projecting neck, of a perforated plate having screvv threaded connection with said neck and an overlying perforated cap pivotally connected With said plate and provided Withvan annular flange surrounding the riin of the n eclr.

Y 3. TheA combination with a telephone transmitter provided With a neck for admission of sound Waves, a perforated plate devtaclnably connected with said neck and an overlying' perforated cap pivotally secured to said late and having anvannular flan 'e surrounding the neck and providing an eX- ternal annular finger-hold by Which said overlying cap may be rotatably adjusted over the perforated plate. l Y

4. The combination With a telephone transmitter provided With a sound Wave opening, of a pair of valve plates supported in superposed relation over said opening and each provided with a series 'of inner and outer passages offset circumferentially andV GASTON BoissoNNAULT. 

